Increasing tyre size





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  1. #1
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    Default Increasing tyre size

    Hoping I can get some answers. I had a suspension lift done to my Toyota d4d and now my tyres / rims look to small for bakkie. I have 16inch tyres on the bakkie. Do I upgrade the tyres or put bigger rims and tyres on ? All suggestion will be appreciated.

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    Default Increasing tyre size

    Rims have nothing to do with overall tyre size. You can still have a 31 tall overall tyre size with 16 or 18 or 20 rims etc.

    The size of the tyre itself is what determines the overall size. For your vehicle with a 2 lift I would think 265/75R16 is the best bigger size that is freely available.

    EDIT: If you do proper off-roading or overlanding upping the rim size is counterproductive as you will have less tyre sidewall, less deflation potential and a harder ride.

    If you want bigger rims for the looks that up to you....stupid but up to you
    Last edited by pjf110; 2020/03/19 at 09:27 AM.
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  4. #3
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    Default Re: Increasing tyre size

    Quote Originally Posted by pjf110 View Post
    Rims have nothing to do with overall tyre size. You can still have a 31 tall overall tyre size with 16 or 18 or 20 rims etc.

    The size of the tyre itself is what determines the overall size. For your vehicle with a 2 lift I would think 265/75R16 is the best bigger size that is freely available.

    EDIT: If you do proper off-roading or overlanding upping the rim size is counterproductive as you will have less tyre sidewall, less deflation potential and a harder ride.

    If you want bigger rims for the looks that up to you....stupid but up to you
    This 100%
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    Default Re: Increasing tyre size

    Quote Originally Posted by Luka View Post
    This 100%
    yep spot on
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    Default Re: Increasing tyre size

    Lifted my prado, increased tyre size 65 to 70 profile (same rims same width) and despite what everyone says, I noticed a drop in performance and increase in pump to pump calculated consumption, lived with it for a year or two then chucked them off and went back to 265-65/17 Std size.

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    Default Re: Increasing tyre size

    Quote Originally Posted by sparewheel View Post
    Lifted my prado, increased tyre size 65 to 70 profile (same rims same width) and despite what everyone says, I noticed a drop in performance and increase in pump to pump calculated consumption, lived with it for a year or two then chucked them off and went back to 265-65/17 Std size.
    yes, you would see that

    "everyone" should be evaluated: who was this everyone?
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    Default Re: Increasing tyre size

    Quote Originally Posted by sparewheel View Post
    Lifted my prado, increased tyre size 65 to 70 profile (same rims same width) and despite what everyone says, I noticed a drop in performance and increase in pump to pump calculated consumption, lived with it for a year or two then chucked them off and went back to 265-65/17 Std size.
    Very few discussions on this forum go without mention of these expected changes.
    The OP doesn't specify current tyre size, but one would expect it to be 265/70x16. A move to 75 with same width and rims, will change overall wheel size by just under 5%. This means a 5% shift in power on the road, odo reading and speedometer reading. Calculated fuel consumption will then obviously move by 5% as well. Actual consumption doesn't have to change, in particular if you adjust your speedo cruising speed down by 5%.

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    Default Re: Increasing tyre size

    Quote Originally Posted by RoelfleRoux View Post
    Very few discussions on this forum go without mention of these expected changes.
    The OP doesn't specify current tyre size, but one would expect it to be 265/70x16. A move to 75 with same width and rims, will change overall wheel size by just under 5%. This means a 5% shift in power on the road, odo reading and speedometer reading. Calculated fuel consumption will then obviously move by 5% as well. Actual consumption doesn't have to change, in particular if you adjust your speedo cruising speed down by 5%.
    however, based on pure physics, more rubber and a larger rolling circumference implies more torque required to rotate the wheel mass which means that all things being equal, there MUST be a trade-in on power and/or fuel consumption

    That being said, a 5% change is almost inconsequential.

    That means a consumption change from 10L/100 km to 10.5L/100km: that is almost insignificant.
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    Default Re: Increasing tyre size

    Maybe a similar question which i am unsure of, can you help?

    I have a Fortuner with 265/75R16 tyres. I wish to change tyres, but my chosen tyre only comes in 265/75R17.

    Does this small change mean i need to change the wheels?

    thanks for your help in this hour of ignorance

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    Default Re: Increasing tyre size

    Quote Originally Posted by bobscratchit View Post
    Maybe a similar question which i am unsure of, can you help?

    I have a Fortuner with 265/75R16 tyres. I wish to change tyres, but my chosen tyre only comes in 265/75R17.

    Does this small change mean i need to change the wheels?

    thanks for your help in this hour of ignorance
    You have 16" rims, that size you want is a 17" rim. So you will have to get 17" rims.
    One of the stupid mistakes in life is to underestimate peoples level of stupidity!

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    Default Re: Increasing tyre size

    Quote Originally Posted by bobscratchit View Post
    Maybe a similar question which i am unsure of, can you help?

    I have a Fortuner with 265/75R16 tyres. I wish to change tyres, but my chosen tyre only comes in 265/75R17.

    Does this small change mean i need to change the wheels?

    thanks for your help in this hour of ignorance
    Yip the 16 and 17 mentioned is the rim size in inches.

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    Default Re: Increasing tyre size

    Quote Originally Posted by jelo View Post
    yes, you would see that

    "everyone" should be evaluated: who was this everyone?
    You'll probably see by the responses who "everyone" is....

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    Default Re: Increasing tyre size

    Quote Originally Posted by Luka View Post
    You have 16" rims, that size you want is a 17" rim. So you will have to get 17" rims.
    Quote Originally Posted by Yster1979 View Post
    Yip the 16 and 17 mentioned is the rim size in inches.
    yep, all of the wheel rims will need to change
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    Default Re: Increasing tyre size

    Quote Originally Posted by jelo View Post
    yep, all of the wheel rims will need to change
    all 4 rims?
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    Default Re: Increasing tyre size

    No all 5 then none will fit.
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    Default Re: Increasing tyre size

    Quote Originally Posted by douglash View Post
    all 4 rims?
    all 5 in fact, depending on how the vehicle traction control and ESC and ABS handles varying wheel sizes

    It's stupid to have different rim sizes on a vehicle.
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    Default Re: Increasing tyre size

    Quote Originally Posted by Luka View Post
    You have 16" rims, that size you want is a 17" rim. So you will have to get 17" rims.
    Many thanks, cross those tyres off the list then

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    Default Re: Increasing tyre size

    Quote Originally Posted by Luka View Post
    You have 16" rims, that size you want is a 17" rim. So you will have to get 17" rims.
    Don't believe you will get the 265/75/17 to fit inside the arch when is comes to turning

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    Default Re: Increasing tyre size

    Quote Originally Posted by Gajac View Post
    Don't believe you will get the 265/75/17 to fit inside the arch when is comes to turning
    the original request didn't specify tyre profile
    you can get a 17" tyre with exactly the same width and diameter as a 16" tyre, the car won't know the difference
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    Default Re: Increasing tyre size

    https://youtu.be/jO6QYM59ANw


    This is a nice video on pro's and cons when changing tyre and rim sizes.

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